feat: embed daemon JS in binary, eliminate npm install of camoufox-browser

The daemon JS files (daemon.js, server.js, browser.js, protocol.js,
snapshot.js, ipc.js) are now EMBEDDED in the compiled Rust binary via
include_dir! and extracted to ~/.gyandoot/daemon/ on first run.

This eliminates the need to npm install -g camoufox-browser@0.1.0,
which bundles an incompatible camoufox-js@0.9.3 that caused:
- 'Cannot open database' errors
- Re-downloading 298MB browser on every navigation
- Circular install/remove/install loops

Now the daemon imports camoufox-js from the global npm install (v0.11.0)
which is installed by install.sh. Clean, no bundled deps, no conflicts.

Also removed: is_npm_package_installed(), install_npm_package(),
find_daemon_js() — all replaced by gyandoot_browser::daemon::extract_daemon()

crates/gyandoot-browser/daemon/daemon.js

@@ -0,0 +1,16 @@
+#!/usr/bin/env node
+/**
+ * Daemon entrypoint (spawned by CLI).
+ *
+ * Listens on a per-session IPC endpoint (Unix socket or Windows localhost TCP).
+ * The CLI communicates via JSON-line protocol.
+ */
+import { DaemonServer } from "./server.js";
+async function main() {
+    const server = new DaemonServer();
+    await server.start();
+}
+main().catch((err) => {
+    process.stderr.write(`[camoufox-browser] Fatal: ${err?.message ?? String(err)}\n`);
+    process.exit(1);
+});